My car is a July 2016 registered car which was ordered from the importers stash of cars mid July. It came with RC4 which did not give trip "A" information on the info display. The RC5 update fixed this, if your car shows all the fuel consumptions (4mpg optimistic) I suspect it will have RC5 although mine didn't.
I can see all the fuel consumption figures in my June 2016 registered car including trip "A" on the info display. So I guess that means I have RC5 installed if thats what it is intended to fix.
I hope you are right but I wouldn't rush to that conclusion ....
I would wait for a few tankfulls to be sure....mine didn't show up straightaway.
And I would be surprised from what you have told us if you have RC5. The Service Bulletin for RC4 said "apply on Customer Complaint only" so it wouldn't be part of normal pre delivery. And you are the first customer who might have complained. Maybe RC5 is part of redelivery. I never saw the SB for RC5.
BTW it was RC4 which fixed the Trip A problem. I had it done soon after I took delivery in June last year. I had RC5 done later for the restarting/crashing.